Patent GB-1228181-A (GB)
IPC: F01B7/00
Filed: 1968-04-25
Abstract: 1,228,181. Reciprocating pumps; I. C. engine driving gear; reciprocating compressors. D. ODAWARA. April 25, 1968 [April 28. 1967; June 10, 1967], No.19742/68. Headings F1A, F1B and F1N. [Also in Division F2] Conversion of reciprocating motion into rotary motion, or vice versa, in a piston machine including a plurality of pistons 3 in cylinders 2 arranged circumferentially about a central axis, e.g. an I.C. engine, pump or compressor, is effected by pins 8 mounted radially on the pistons and engaging in an endless cam groove 18 formed on the inner surface of one or more rotary cylindrical sleeves 20 rotating about an axis parallel to the axes of the cylinders 2. As shown, the cam groove 18 is defined by two cylindrical cams 6, 6<SP>1</SP>, mounted in the sleeve 20 fast with a rotary shaft 1, the piston 3 being prevented from rotating by the pin 8 passing through a straight slot 16 in the fixed cylinder 2. Again, Fig. 3 (not shown), two double pistons 3 each comprising a pair of oppositely directed pistons on common piston rods 4 and having common pins 8, slide in a common fixed cylinder 2. A plurality of the cylinders 2 are arranged circumferentially about a central axis and the pins 8 engage in cam grooves 18 mounted on cylindrical sleeves 20 each formed with an external ring gear (22) meshing a gear (23) on the shaft 1 parallel to the fixed cylinder. Further, Figs.4-6, (not shown), six pistons 3 are arranged in six cylinders arranged circumferentially about the shaft 1, their pins 8 engaging a common cam groove 18 in the sleeve 20 on shaft 1. In Fig. 7, (not shown), twelve cylinders are arranged around the shaft 1, six cylinders on each of two concentric circles with the inner sliding blocks 7 connected to the outer blocks which carry the pins 8 engaging in a common cam groove. Again, Fig. 8, (not shown), two units of the machine of Fig.6 (not shown) are connected back-to-back so that their pins engage in two cam grooves 18 mounted on a common sleeve 20 on shaft 1. In Fig. 9, (not shown), the pins 8 extend through the blocks 7 and engage in outer and inner cam grooves 18, (15), the inner cam groove (15), being mounted on a boss (24) integral with sleeve 20 and surrounding the shaft 1. Antifriction means, e.g. roller bearings, are mounted on the pins 8 where they pass through the inner and outer straight slots (16<SP>1</SP>) in the fixed cylinders 2. In Fig. 10, (not shown), four cylinders I. C. engine is shown in which each piston has a pin 8 extending radially outwards and carrying double antifriction means, e.g. a double roller bearing, engaging in a cam groove formed in a bracket 20 on a shaft 1, the bracket 20 also carrying two axially extending cam surfaces which engage tappets to open and close inlet and outlet valves through push rods and rockers. In Fig. 11, (not shown), each cylinder carries a double piston with valves at each end, the cylindrical bracket 20 having an external ring gear (22) engaging a gear (23) on a parallel shaft 1. By providing the engine with injection pumps and nozzles it may operate in a diesel cycle. In Fig.13, (not shown), the shaft 1 of the Fig. 10 embodiment extends through the fixed cylinder block. Again, Fig. 14, (not shown), an I.C. engine is formed by combining the embodiments of Figs. 8 and 9, the pins 8 being received by double roller bearings in their cam grooves, and cam faces being formed on the sleeve 20 to operate the inlet and outlet valves. In Fig. 16, (not shown), various cam grooves for two-cycle, four-cycle, or six-cycle machines, for four-cycle machines with a casting stroke, and for two-cycle machines with non-compressible fluids, are shown.